include/linux/netfilter_bridge.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_BRIDGE_NETFILTER_H
   3 #define __LINUX_BRIDGE_NETFILTER_H
   4
   5 #include <uapi/linux/netfilter_bridge.h>
   6 #include <linux/skbuff.h>
   7
   8 struct nf_bridge_frag_data {
   9         char    mac[ETH_HLEN];
  10         bool    vlan_present;
  11         u16     vlan_tci;
  12         __be16  vlan_proto;
  13 };
  14
  15 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
  16
  17 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
  18
  19 static inline void br_drop_fake_rtable(struct sk_buff *skb)
  20 {
  21         struct dst_entry *dst = skb_dst(skb);
  22
  23         if (dst && (dst->flags & DST_FAKE_RTABLE))
  24                 skb_dst_drop(skb);
  25 }
  26
  27 static inline struct nf_bridge_info *
  28 nf_bridge_info_get(const struct sk_buff *skb)
  29 {
  30         return skb_ext_find(skb, SKB_EXT_BRIDGE_NF);
  31 }
  32
  33 static inline bool nf_bridge_info_exists(const struct sk_buff *skb)
  34 {
  35         return skb_ext_exist(skb, SKB_EXT_BRIDGE_NF);
  36 }
  37
  38 static inline int nf_bridge_get_physinif(const struct sk_buff *skb)
  39 {
  40         const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
  41
  42         if (!nf_bridge)
  43                 return 0;
  44
  45         return nf_bridge->physinif;
  46 }
  47
  48 static inline int nf_bridge_get_physoutif(const struct sk_buff *skb)
  49 {
  50         const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
  51
  52         if (!nf_bridge)
  53                 return 0;
  54
  55         return nf_bridge->physoutdev ? nf_bridge->physoutdev->ifindex : 0;
  56 }
  57
  58 static inline struct net_device *
  59 nf_bridge_get_physindev(const struct sk_buff *skb, struct net *net)
  60 {
  61         const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
  62
  63         return nf_bridge ? dev_get_by_index_rcu(net, nf_bridge->physinif) : NULL;
  64 }
  65
  66 static inline struct net_device *
  67 nf_bridge_get_physoutdev(const struct sk_buff *skb)
  68 {
  69         const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
  70
  71         return nf_bridge ? nf_bridge->physoutdev : NULL;
  72 }
  73
  74 static inline bool nf_bridge_in_prerouting(const struct sk_buff *skb)
  75 {
  76         const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
  77
  78         return nf_bridge && nf_bridge->in_prerouting;
  79 }
  80 #else
  81 #define br_drop_fake_rtable(skb)                do { } while (0)
  82 static inline bool nf_bridge_in_prerouting(const struct sk_buff *skb)
  83 {
  84         return false;
  85 }
  86 #endif /* CONFIG_BRIDGE_NETFILTER */
  87
  88 #endif